the ratio of girls to boys is:
[tex] \frac{number \: of \: girls}{number \: of \: boys} = \frac{10}{15} = \frac{2}{3} [/tex]
the ratio of striped ties to to solid ties is:
[tex] \frac{number \: of \: striped \: ties}{number \: of \: solid \: ties} = \frac{7}{21} = \frac{1}{3} [/tex]
